Drag-saw.



. No. 870,712. PATENTED NOV. 12, 1907.

' D. ROAMPBBLL.

DRAG SAW.

APPLICATION FILED JANkfifi. 1907.

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No. 870,712. PATENTED NOV. 12, 1907. D. P. CAMPBELL.

DRAG SAW.

APPLICATION FILED my 26. 1907.

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citizen of the United States, and resident of Eureka,

DANIEL FRASER CAMPBELL, OF EUREKA, CALIFORNIA.

DRAG-SAW.

Specification of Letters Patent.

Patented Nov. 12, 1907.

Application filed January 26,1907. Serial No. 354,266.

To all whom it may concern.-

Be it known that I, DANIEL FRASER CAMPBELL, a

in the county of Humboldt and State of California, have invented certainnew and useful Improvements in Drag-Saws, of which thefollowing is afull, clear, and exact description, such as will enable those skilled inthe art to which it appertains to make and use the same, reference beinghad to the accompanying drawings, forming part of this specification.

The invention relates to improvements in drag-saws of that descriptionin which the blade is reciprocated by power driven mechanism mounted onan adjustable supporting frame.

It has for its object the provision of means for imparting a rockingmotion to the blade so that the latter pivots on the central part of thelog being sawed and cuts in the far side of the kerf in its forwardmovement and in the near side on the return stroke. In this way thesaw-operates to a better advantage to clear the kerf of sawdust than itwould with the teeth engaging the wood the entire length of the kerfduring both the forward and return strokes.

The invention also has for its object the provision of means foradjusting the saw so that it can be properly positioned relative to thelog and also means for securing the machine after it has been placed.

The invention consists in the novel construction, combination andarrangement of parts, such as will be hereinafter fully described,pointedout in the appended claims and illustrated in the accompanyingdrawings.

In the drawings, in which similar reference characters designatecorresponding parts, Figure 1 is a plan view of a machine embodying theinvention. Fig. 2 is a front elevation. Fig. 3 is a side elevation.

To the opposite members of the bifurcated frame 1 are secured the shoes2 on which the machine is piopelled. At the open end of the frame ismounted the axle-3 on which are journaled the wheels 4. When the machineis in operative position these wheels rest on the ground and with theaxle form a pivot on which the saw can be adjusted. Between the sides ofthe frame 1 is pivoted the forked trail 5 with its apex extendingbeneath the free end of the frame. To the apex of the trail is hingedthe lower end of the screw 6 engaging at its upper end with the nut 7seated in the free end of the frame. When the machine is in operativeposition the outer end of the trail rests on the ground and by turningthe nut 7 the frame can be adjusted on its pivot to the requiredposition.

On the main frame 1 near its pivoted end are mounted the arches 8 on thecrowns of which is journaled the Shaft 9 having the crank-arm 10. Theshaft is rotated by the pulley 11 driven by any suitable source ofpower. On the shaft on opposite sides of the crankai'm are the eccentricdisks 12 in the same relative position on the shaft. On each disk is astrap 13 having lugs 14 on opposite sides. Secured to the lugs of eachstrap by the bolts 15 is the tubular guide 16. The tubular guides areconnected at their outer ends by the cross-piece 17. Movable in thetubular guides are the guide-rods 18 connected at their outer ends tothe saw 19. The latter is connected by the pitman 20 with the crank-arm10 and is reciprocated by the rotation of the shaft 9. The eccentricdisks are arranged so that they raise the tubular guides during theforward movement of the saw and lower them during the return stroke. Theguide-rods 18 moving in the tubular guides 16 impart a rocking motion tothe saw while the machine is in operation. The saw pivots on the centralpart of the log and during its forward movement cuts in the far side ofthe kerf and on its return stroke cuts in the near side of the kerf.This causes the teeth, to clear the saw-dust from the opposite sides ofthe kerf without dragging it the entire length of the I cut as theywould should they engage the wood during the entire length of eachstroke.

On the main frame 1 and the arches 8 are the eyes 21 to engage the rods22. The engaging end of each rod is a compound curve, as at 23, to holdagainst both a pull and a thrust. On the outer ends of the rods are thedogs 24 adapted to be driven into the wood that is to be sawed. The rod22 at the front end of the machine is connected by the hook 25 with theupright 26 to hold themachine against wabbling. By means of the rods anddogs the machine can be anchored in place after it has been positionedand adjusted.

Having thus described my invention, what I claim and desire to secure byLetters Patent is,

1. In a dragsaw, a pivoted bifurcated frame, a forked trail pivoted atits open end between the members of said frame, means for relativelyadjusting said frame and said trail, and a reciprocativc saw blademounted on said frame.

2. In a drag saw, a pivoted bifurcated frame, a forked trail pivoted atits open end between the members of said frame, a nut carried by saidframe, a screw hinged to said trail and engaging said nut, and areciprocative saw blade carried by said frame.

3. In a drag-saw, a saw blade, means for reciprocating said blade, arotatable shaft, an eccentric disk on said shaft, a tubular guideattached to said disk, and a guide rod movable in said tubular guide andconnected with said blade.

4. In a drag-saw, a rotatable shaft, 21 crank-arm on said shaft, a saw,a pitman connecting said saw with said cranlHu-m, an eccentric disk onsaid shaft, a tubular guide connected with said disk, and a guide-rodmovable in said tubular guide and connected with said saw.

5. In a drag-saw, a pivoted frame, a trail pivoted to said frame, meansfor relatively adjusting said frame and said trail, a rotatable shaft onsaid frame, an'eccentric disks on said shaft on opposite sides of thecrank, tubular 10 disk on said shaft, a tubular guide connected Withsaid guides connected with said disks, and guide-rods movable disk, aguide-rod movable in said tubular guide, a saw in said tubular guidesand connected with said blade.

blade attached to said guide-rod, and means for reciprocat- In testimonywhereof I hereunto afiix my signature in ing said blade. the presence oftwo Witnesses.

6. In a drag-saw, a pivoted bifurcated frame, arches DANIEL FRASERCAMPBELL. mounted on the members of said frame, a crank-shaft jour-Witnesses naled on the crowns of said arches, a saw blade, a pitman A.C. Non,

connecting the crank of the shaft with said blade, eccentric D. W.HANSON.

